body{
    background-color: aquamarine;
}
form
{
    width:100%;
    height:700px;
    margin-top:80px;
    margin-left: 400px;
    text-align: center;

}
div
{
    display:inline-block;
    padding-top: 40px;
    padding-left: 0px;

}
h2
{
    font-family: "微软雅黑";
    font-size: 40px;
    color:black;
}
#reg
{
    color:blue;
}